Sedimentary types,characteristics and model of lacustrine fine-grained gravity flow in the Member 7 of Trassic Yanchang Formation in Ningxian area,Ordos Basin
LU Qiqi1, XIN Honggang2,3, WANG Lin1, LUO Shunshe1, DAN Weidong2,3, FENG Shengbin2,3
1 School of Geosciences,Yangtze University,Wuhan 430100,China; 2 National Engineering Laboratory for Exploration and Development of Low Permeability Oil & Gas Fields,Xi'an 710018,China; 3 Exploration and Development Research Institute of Changqing Oilfield Branch Company Ltd., PetroChina,Xi'an 710018,China
Abstract The lacustrine fine-grained gravity flow sand body is a favorable target area for exploration in deep-water basins. Based on core,drilling,well logging,mud logging and thin section identification,the sedimentary types,characteristics,sedimentary evolution process and sedimentary model of fine-grained gravity flow are studied in the Member 7 of Yanchang Formation in the Ningxian area,Ordos Basin. The findings results show the presence of ten lithofacies,six lithofacies associations,and five types of deep-water sediments,including slide-slump deposits,sandy debris flow deposits,hybrid event bed,turbidity current deposits and deep lacustrine muddy deposits. According to the lithofacies and their combination characteristics,the semi-deep to deep lake subfacies can be further divided into six sedimentary microfacies: confined channel,unconfined channel,levee,lobe,inter-channel and semi-deep to deep lake mud. The delta front sediments destabilized under the action of external forces,and experienced five evolution stages of sliding,slumping,sandy debris flow,hybrid event bed,and turbidity currents. With the“fluid transformation and separation”and“hydroplaning”,the gravity flow deposits gradually evolved from confined channel-levees,unconfined channel-levees,to lobes toward the center of basin. This study will help to deepen the understanding of lacustrine fine-grained gravity flow deposits and provides guidance for deep-water oil and gas exploration and development.
Fund:National Natural Science Foundation of China(No.42102170)and the National Basic Research Program(973 Program)of China(No.2014CB239003)
Corresponding Authors:
LUO Shunshe,born in 1961,is a professor in the School of Geosciences,Yangtze University. He is mainly engaged in sedimentology and reservoir geology. E-mail: 201673021@yangtzeu.edu.cn.
About author: LU Qiqi,born in 1986,is an associate professor in the School of Geosciences,Yangtze University. He is mainly engaged in unconventional oil and gas sedimentology research. E-mail: lvqiqiabcd@163.com.
Cite this article:
LU Qiqi,XIN Honggang,WANG Lin et al. Sedimentary types,characteristics and model of lacustrine fine-grained gravity flow in the Member 7 of Trassic Yanchang Formation in Ningxian area,Ordos Basin[J]. JOPC, 2023, 25(4): 823-840.
LU Qiqi,XIN Honggang,WANG Lin et al. Sedimentary types,characteristics and model of lacustrine fine-grained gravity flow in the Member 7 of Trassic Yanchang Formation in Ningxian area,Ordos Basin[J]. JOPC, 2023, 25(4): 823-840.
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